I cleared the cache. The problem is still there. I tried manually force closing the app, it refuses though. When I tap the force close button, it shows me pressing it but it doesn't do anything, it goes back to its "unpressed" look. And I keep pressing it over and over, nothing happens.

I've gotten this too. I've found that it works for a while after first boot, but at some point starts failing. A reboot clears it. My guess is something in their improved battery life fix introduced some kind of memory leak where attempting to use the settings tool to query battery properties results in a crash/force close.

It'll probably be a while before they address this in another OTA update or patch.